where to get L-J charactoristic length of C2H6
 

Dear Mr. or Mrs:

I want to define diffusion coefficient of the ethane-air mixture as "kinetic theory". But I have no two properties of C2H6. That is L-J charactoristic length and L-J energy parameter. Can you tell me where to get L-J charactoristic length and L-J energy parameter of C2H6.

Any information is welcomed.

Thank you. Sincerely yours, Harry Qiu.